i would get something in like the 95 to like 110 underfoot range. but im not really sure past that
i know how you feel though. i've been skiing the ice coast since i was three, always had a real racing style, like to carve up groomers and steeps with my brothers.
This summer i spent two weeks skiing in New Zealand and i rented twin tips the whole time i was there. i tought myself a lot of park stuff, and also got to ski some awesome open pow lines (theres no trees). Now all i do is watch movies about skiing huge lines or waist deep pow, and some park too. now i still like to carve, but i also love to mess around, teaching myself more park, skiing groomers switch, and hiking around to find pow and stuff. I just bought myself a pair of Fischer Addicts that i really like, but their definitely not a powder ski. awesome for everything else though